<![CDATA[THERMAL UNIT (MLX 90640) does not work.]]>I have M5Stack Gray and Thermal Unit.
I use Arduino IDE and I installed Arduino core for ESP32 using the board manager.

I tried the example sketch that was included with M5Stack library.
https://github.com/m5stack/M5Stack/tree/master/examples/Unit/MLX90640

I find that the THERMAL UNIT works or not is depending on the version of the ESP32 software.

  • ESP32 v1.0.0 : not work
  • ESP32 v1.0.1-rc1 : work
  • ESP32 v1.0.1-rc2 : not work
  • ESP32 v1.0.1-rc3 : not work
  • ESP32 v1.0.1-rc4 : not work
  • ESP32 v1.0.1 : not work

Only the v1.0.1-rc1, the Thermal Unit works. But I do not find the reason.

I want to work the Thermal unit with lastest version of ESP32 software.
Please give me some advice.

]]>https://community.m5stack.com/topic/503/thermal-unit-mlx-90640-does-not-workRSS for NodeSat, 02 May 2026 22:33:15 GMTSat, 12 Jan 2019 02:24:32 GMT60<![CDATA[Reply to THERMAL UNIT (MLX 90640) does not work. on Thu, 17 Jan 2019 03:38:29 GMT]]>@yellowelise

I was glad that I could understand why I could not get the data.
Thank you.

]]>https://community.m5stack.com/post/2531https://community.m5stack.com/post/2531Thu, 17 Jan 2019 03:38:29 GMT<![CDATA[Reply to THERMAL UNIT (MLX 90640) does not work. on Wed, 16 Jan 2019 14:38:32 GMT]]>@tchisaka
you like the "improvement"?

]]>https://community.m5stack.com/post/2527https://community.m5stack.com/post/2527Wed, 16 Jan 2019 14:38:32 GMT<![CDATA[Reply to THERMAL UNIT (MLX 90640) does not work. on Wed, 16 Jan 2019 07:23:21 GMT]]>@heybin

I fixed the code according to your advice.
I got data from MLX 90640 with Arduino core ESP32 v1.0.1.
Thank you !

]]>https://community.m5stack.com/post/2526https://community.m5stack.com/post/2526Wed, 16 Jan 2019 07:23:21 GMT<![CDATA[Reply to THERMAL UNIT (MLX 90640) does not work. on Wed, 16 Jan 2019 07:16:50 GMT]]>@yellowelise
Thank you !
Using your programs, I got the data from MLX 90640.

]]>https://community.m5stack.com/post/2525https://community.m5stack.com/post/2525Wed, 16 Jan 2019 07:16:50 GMT<![CDATA[Reply to THERMAL UNIT (MLX 90640) does not work. on Tue, 15 Jan 2019 04:31:28 GMT]]>hello, change the MLX90640_I2C_Driver.cpp line 46

 if (Wire.endTransmission(false) != 7)
 to
 if (Wire.endTransmission(false) != 0)

because in ESP32 v1.0.1-rc1, Wire.endTransmission(false) ok will return 7 not 0, in last, is different

]]>https://community.m5stack.com/post/2505https://community.m5stack.com/post/2505Tue, 15 Jan 2019 04:31:28 GMT<![CDATA[Reply to THERMAL UNIT (MLX 90640) does not work. on Mon, 14 Jan 2019 15:07:28 GMT]]>This my version (improved) can you try?
https://github.com/yellowelise/M5Stack-Thermal-MLX90640

]]>https://community.m5stack.com/post/2492https://community.m5stack.com/post/2492Mon, 14 Jan 2019 15:07:28 GMT